I'm having a problem with my XR200R. Whenever the throttle is wide open the bike coughs and stutters. If you are in any gear and you gradually increase the throttle, as soon as it is wide open it begins to cough. It still kicks you forward but in short little bursts and continues to do so if you hold the throttle open. The bike also does this if you shift into a gear and open the throttle all the way, right away. I cleaned out the carb, didn't fix it. Does anybody have any ideas of where to go from here? Thanks alot.